The Eridians are the alien species whom created the Vault. Some of the weaponry and other equipment scattered around Pandora originated from the Eridians. Even though little in known about this strange race, the importance is quite unquestionable. Humanity, namely the Atlas Corporation, had advanced greatly from reverse engineering this technology, and not just Pandora, many other planets along with it.
The Eridian weapons are amongst the rarest weapons in the game and offer some of the greatest benefits. The energy blasts fired cause shock elemental damage and have no ammunition or reload. However, the guns stall after a certain number of shots during which the energy must reload. To avoid this, simply unequip and reequip the weapon!
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